Casting apparatus.



F. G. HIN MAN. CASTING APPARATUS. APPLIOATION'FILED SEPT. 8, 1914.

Patented Mar. 9, 1915.

I If;

Witnesses I Attorneys FBEDEBICK C. HINMAN, OF LINCOLN. NEBRASKA.

CASTING APPARATUS.

To all whom it may concern:

Be it known that I, FREDERICK .C. I-IIN- MAN, a citizen of the United States, residing at Lincoln, in the county of Lancaster and State of Nebraska, have invented a new and useful Casting Apparatus, of which the following is a specification.

.This invention relates to casting apparatus especially designed for use in dental work.

The principal object of the invention isto provide means whereby the metal may be melted at a point remote from the invest ment, the metal being subsequently dumped onto the investment so that the metal will be almost entirely deposited in the mold by gravity and but slight suction will be necessary in order to complete the filling of the investment.

A. further object is to provide means whereby a metal can be heated to a boiling point and promptly dumped without removing the blow pipe therefrom, thus avoiding any slight delay of heat which would't'end to chill the metal and produce an imperfect casting.

A further object is to provide means whereby the act of dumping the metal onto the investment will operate to open the suction valve, the parts being so proportioned that the suction is started prior to the dumping-of the metal onto the investment.

\Vith the foregoing and other objects in view, which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed can be made within the scope of what is claimed without departing from the spirit of the invention.

In the accompanying drawings, the preferred form of the invention has been shown.

In said drawings :Figure 1 is a view partly in section and partly in elevation of the apparatus, the investment and its crucible being shown in section, and the position of the metal crucible and the valve stem during the pouring of the metal being indicated in dotted lines. Fig. 2 is an elevation of the apparatus. Fig. 3 is a section on the line A -B Fig. 1. Fig. 4 is an enlarged horizontal section through the valve.

Specification of Letters Patent.

Patented Mar; 9 ,1915,

Application filed September 8, 1914. Serial No. 860,671

Referring to the figures by characters of reference 1 designates the casing or'cylinder of a suction pump having a'piston adapted to be operated by a rod 2 in the usual manner. through thecasing and supports the crucible4 in which the investment 5 is adapted to be placed. The investment has the usual conical recess 6 so that molten metal dumped upon th e investment will gravitate A- suction pipe 3 extends quickly to the sprue' 7, the recess 6 being of considerable depth so that gravitation of the metal to the sprue will be facilitated.

Mounted on the suction pipe 3 is astandard -8 having a fork 9 at its upper end within WhlCh a crucible 10 is pivotally mounted,

.this crucible being held iii substantial horizontal position by reason ofthe fact that it is mounted ofi centerand bears downwardly on a stop 11. This crucible is designed to contain a suflicient amount of metal which can be heated in the usual manner to the boiling point. A valve 12 serves to close communication between the crucible 4 and the casing 1, this valve being normally closed and having an arm or stem 13 connected to it. The stem is so proportioned that when it is swung for the purpose of opening the valve 12, saidvalve will first be brought to an open position after which the arm 13 will strike one end of the crucible 10 and elevate it, so that the contents of the crucible will be dumped into the recess 6.

In using the apparatus herein described, the valve 12 is closed and a suificient amount of metal is placed in the crucible 10 and heated to the boiling point, it bein unneeessary to remove the blow pipe em the metal until the desired heat has been ob tained. Any suitable fluxes maybe added, so as to make the metal flow better. As soon as the metal has reached the desired heat, the arm 13 is swung to the position indicated by dotted lines in Fig. 1, first opening the valve so as to create a full suction through the pipe 3 and easing 1. As soon as the full suction is established the arm 13 strikes the crucible 10- and tilts it, thus causing the boiling metal contained therein to dump into the investment. The weight of the metal falling onto the investment ,will be suflicient to practically fill the mold so that only a slight suction will be necessary to complete the castingoperation.

Importance is attached to the fact that the sprue '(lcan be made large'so that metal,

when dumped, passes through easily by gravity. What is claimed is p 1. The combination with an investment ring, means for creating a suction therefrom, and a; valve for preventing said suction;"of a 'metalcrucihle tiltably mounted adjacent said investment ring, a valve stem, and means operated by said stem after the opening of the valve for tilting the crucible to discharge its contents into the ring.

2. The combination with aninvestment ring, means for creating a suction therefrom,

and a valve for preventing the suction, of a tiltably mounted metal crucible, means for supporting said crucible in active position,

and means operated by the opening of the valve for crucible into the investment rin subsequent to the opening of the valve an the establishment of the suction. V

3. The combination with a suction ele-- ment, a pipe extending therefrom, and min-- discharging the contents of the vestment ringsupportedby said pipe, of a. i valve normally closing the pipe, a standard supported by the pipe, a metal crucible movably mounted upon. the standard, and means operated by the opening of the valve for I discharging the contents of the metal crucible into the investment ring has been opened.

4. The combination with an investment ring, means for creating a suctiontherefrom,

after the. valve a valve for preventing said suction, of a crucible tiltably mounted, and means operated by the opening of 'the valve 'for dis- FRED. C. HINMAN. Witnesses FRED Forum, L. G. S'ronmr. 

